package com.ruoyi.member.service.async;

import com.google.common.collect.Lists;
import com.ruoyi.common.core.utils.StringUtils;
import com.ruoyi.member.domain.MemberLevel;
import com.ruoyi.member.service.IMemberService;
import com.ruoyi.system.api.domain.Member;
import java.math.BigDecimal;
import java.util.List;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

/**
 * @author mitao
 * @date 2024/6/6
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class AsyncMethodService {

    private final IMemberService memberService;

    /**
     * 处理修改等级条件金额后，同步调整用户等级
     *
     * @param memberLevels 会员等级条件列表
     */
    @Async
    public void handleMemberLevel(List<MemberLevel> memberLevels) {
        List<Member> list = memberService.list();
        if (StringUtils.isEmpty(memberLevels)) {
            // 如果memberLevels为空或为null，则无需进一步处理
            return;
        }

        List<Member> members = memberService.list();
        if (StringUtils.isEmpty(members)) {
            // 如果成员列表为空或为null，则无需进一步处理
            return;
        }

        for (Member member : members) {
            BigDecimal money = member.getMoney();
            member.setLevel(findAppropriateLevel(memberLevels, money));
        }
    }

    private static int findAppropriateLevel(List<MemberLevel> memberLevels, BigDecimal money) {
        // 对于最开始的level，设置为0（假设0是最低等级）
        int level = 0;

        for (int i = 0; i < memberLevels.size(); i++) {
            MemberLevel currentLevel = memberLevels.get(i);
            BigDecimal currentCumulativeConsumption = currentLevel.getCumulativeConsumption();

            // 如果当前成员的消费额小于等于当前等级的累积消费额
            if (money.compareTo(currentCumulativeConsumption) < 0) {
                return level;
            }

            // 更新level为当前等级，准备下一次比较
            level = currentLevel.getLevel();
        }

        // 如果遍历完成后还没有返回，说明该成员的消费额高于所有已定义等级的累积消费额
        level = memberLevels.get(memberLevels.size() - 1).getLevel();
        return level;
    }

    public static void main(String[] args) {
        MemberLevel build1 = MemberLevel.builder().id(1L).level(1)
                .cumulativeConsumption(BigDecimal.valueOf(100))
                .build();
        MemberLevel build2 = MemberLevel.builder().id(2L).level(2)
                .cumulativeConsumption(BigDecimal.valueOf(200))
                .build();
        MemberLevel build3 = MemberLevel.builder().id(3L).level(3)
                .cumulativeConsumption(BigDecimal.valueOf(300))
                .build();
        MemberLevel build4 = MemberLevel.builder().id(4L).level(4)
                .cumulativeConsumption(BigDecimal.valueOf(500))
                .build();
        MemberLevel build5 = MemberLevel.builder().id(5L).level(5)
                .cumulativeConsumption(BigDecimal.valueOf(500))
                .build();
        MemberLevel build6 = MemberLevel.builder().id(6L).level(6)
                .cumulativeConsumption(BigDecimal.valueOf(600))
                .build();
        MemberLevel build7 = MemberLevel.builder().id(7L).level(7)
                .cumulativeConsumption(BigDecimal.valueOf(700))
                .build();
        MemberLevel build8 = MemberLevel.builder().id(8L).level(8)
                .cumulativeConsumption(BigDecimal.valueOf(800))
                .build();
        MemberLevel build9 = MemberLevel.builder().id(9L).level(9)
                .cumulativeConsumption(BigDecimal.valueOf(900))
                .build();
        MemberLevel build10 = MemberLevel.builder().id(10L).level(10)
                .cumulativeConsumption(BigDecimal.valueOf(1000))
                .build();
        List<MemberLevel> memberLevels = Lists.newArrayList(build1, build2, build3, build4,
                build5, build6, build7, build8, build9, build10);
        System.out.println(findAppropriateLevel(memberLevels, BigDecimal.valueOf(499)));
    }
}